I have two answers, if it pleases the court.
As you included the Legends tag, let me introduce you to two characters whose actions make mind control and storms seem like child's play.
Nihilus was a Sith lord created by the activation of a Mass Shadows Generator superweapon on Malachor V, during the Mandalorian Wars.
He was originally a normal man who, stuck on the planet when the Generator went off, became a wound in the Force. His resulting hunger for Force energy resulted in him Forcefully taking away the energy from people, killing them.
Nihilus was responsible for the devastation of the planet Katarr in
3952 BBY, killing and absorbing the Force energy of the Jedi at the
Conclave on Katarr along with every other living thing on the world
save one Miraluka woman named Visas Marr.
Keep in mind that he did this by speaking.
Vitiate, originally of the Sith race, was the Sith Emperor circa 5000 BBY to 3700 BBY. He obtained immortality through the use of a ritual which stripped the Force from planet Nathema.
Every man, woman, and child on Nathema died that day. Every beast,
bird, and fish; all the insects and plants; every living being touched
by the Force was consumed. When the ritual ended, Nathema was no
longer a world. It was a husk sucked dry. Lord Vitiate sacrificed
millions, stealing their life force to make himself immortal.
Vitiate also later sapped the life from the world of Ziost.
Compared to controlling hundreds of people, or creating a storm less than a mile wide, I believe killing every living creature on an entire planet to be the more powerful show of Force.